Having a beloved pet – a dog, each of us at least just thought about how he sees this world? Easier of course perceive everything as if the dog has the same vision as the person. But this is far from true. Let’s see how Do dogs see the world?
Content
- 1. The structure of the dog’s eye
- 2. Night vision in dogs
- 3. The difference between the view of the dog and man
- 4. Pet care
- 5. Features of the organs of vision of some breeds
- 6. Possible problems with the eyes of the pet
Dog Eye Structure
If we consider the anatomical structure of the eyeball dogs, you can see that it, as it were conditionally, consists of two halves – upper and lower.
The upper part is responsible for visual acuity against a dark shade land. Behind its photoreceptors is a membrane with reflective action. Light penetrating the dog’s eyes turns out to be reflected by this membrane. And as a result – creepy glow of eyes at night or in twilight.
The rods and cones present in the eyes of the animal capture reflected rays. Thus, the dog’s eye receives two rays from one.
The lower part of the eye, more precisely, its retina, has a dark a pigment that absorbs and quenches the excess of light. This gives a definite advantage to the pet is the ability to optimally see in conditions of an excess of lighting.
Dogs night vision
Everyone knows that cats see perfectly in the dark. But what about Is this the case with dogs? Dogs do not apply to night animals, not to daytime, are somewhere in the middle. If again turn to the structure of the eyes, then the presence of a large number of sticks is a sign that dogs see better during the day than at night. However, this amount plays a role and with insufficient illumination.
In dogs, behind the cones and rods, there is a layer under name tapetum, which includes reflective pigment. The light that enters the eyes of an animal is almost all perceived at the cellular level, so if you compare the night the dog’s and man’s eyesight, in a dog it is 3-4 times sharper.
The difference between the dog and man
The man, both children and adults, has been worried for several years by the question what colors do dogs see?
For a long time, US scientists tried to figure this out and More recently, they were able to prove that our four-legged friends have color perception, although somewhat different from what possessed by man.
And, of course, the structure of the dog’s eyes plays a role in this. Cones which are responsible for color perception, dogs have, but in much less than human. Also human the eye is much more complex, since there are cones of three varieties, each of which carries reaction in its color range:
- Reacts to long-wave radiation – in its field sensitivity red and orange shades.
- It is sensitive to medium waves – we are talking about yellow and green colors.
- Third cones capture a range of colors – purple, blue and blue.
No cones appear in the dog’s eye sensitivity to red shades. This was the reason that dogs do not see much difference between the yellow-green palette and orange and red flowers. Same color perception observed in people with color blindness. For example, for the person is blue-green, for the dog can be seen how White color.
Another significant difference between the structure of human and the canine eye is that in a person in the center of the retina, in the area of the optical axis of the eye, there is a “yellow spot”, consisting exclusively of cones. Its availability allows catch the cones direct rays of light that are not damaged when passing through the cornea and lens. In the structure of the eyeball dogs there is no such spot, which affects the fact that the sharpness Pet sight is approximately three times lower.
Theoretical calculations indicate that if the dog’s vision check with the help of an oculist table, her view will be available only the third line. Although a person with good vision sees tenth.
Nevertheless, it is impossible to blame the animal for myopia, since scientific studies have found that dogs have a small farsightedness (about +0.5 diopters). This indicator can equate to vision the majority of people of mature age.
Pet Vision Care
A dog’s eyes are, if not a mirror of the soul, then its indicator health. According to them, an experienced breeder or veterinarian can say the animal is sick or not. Clean, dry eyes, with lively shine, without swelling and redness – this is a sign of a completely healthy pet.
If everything is okay with the eyes, then in most cases, they don’t require any care. Sometimes in the inner corners of a dog’s eyes discharge may accumulate. If their number is insignificant, then just remove them with a piece of gauze or a cotton pad. Use cotton wool for these purposes is not recommended, since it particles can get inside and cause discomfort and even inflammation.
For such processing, you can use the following liquids:
- boiled water;
- saline solution;
- weak solution of furatsilin.
Tea brewing traditional for people is also suitable, only there one small nuance – in dogs with light hair, it can leave painted areas.
Features of the organs of vision of some breeds
There are a number of breeds in which the organ of vision, for one or another reasons, is a weak point and requires a closer look attention:
- Dogs with a short face of a flattened shape – Pekingese, hins, pugs, shih tzu, French bulldogs and the like dogs. The special anatomical structure of the muzzle leads to the fact that the natural secret from the eyes can flock to the skin folds on face, thereby causing discomfort, itching and irritation. Such dogs require more regular cleaning. eye.
- Species with elongated muzzle hair – all varieties schnauzers, some types of terriers. Flowing down wool, tears and secretions can significantly worsen the condition of the hair on the face, gluing it together, which leads to tangling and the formation of tangles. To prevent this, you need to pay more attention to the condition eye and regularly clean not only the eyes but also the hair on face.
- Species with excess skin and folds in the head and muzzle – sharpei, cocker spaniels, basset hounds and others. Thanks to such especially, pets of these breeds are prone to diseases organs of vision, and most often occurs inversion of the eyelids. Exist two types of disease – inversion of the internal and external, but both provide the dog with discomfort and possible complications, up to complete blindness. In non-critical situations, quite simple eye treatments and moisturizers. With exacerbation only surgical intervention helps the disease. Eyelid hemming can save the dog from further eye problems.
Possible problems with the eyes of the pet
When the usual, unremarkable discharge is not the only eye problem? If the discharge just got bigger, but their appearance has not changed, then most likely the pet was blown up by a draft. In this case, washing the eyes with the same means that are used for conventional procedures.
It is worth the alarm if the eye secret has changed its color to greenish or brown, its amount has changed significantly and you smell bad. In this case, an animal is required should be shown to the veterinarian, as all signs indicate disease of infectious origin.
There is a noticeable swelling on the eyelids of the eyes. Reasons may to be somewhat, both trauma and a sign of infectious diseases. In any case, the doctor can more accurately say.
The pet is trying to avoid direct rays of light, hiding in the shade, moving without former confidence? This is a signal that he significant vision problems. And in this case – the veterinarian in help.
Any problems with the pet’s visual apparatus should be addressed. only by a qualified specialist!
